• Webster's Revised Unabridged Dictionary
    • n Pedrail (Mach) A device intended to replace the wheel of a self-propelled vehicle for use on rough roads and to approximate to the smoothness in running of a wheel on a metal track. The tread consists of a number of rubber shod feet which are connected by ball-and-socket joints to the ends of sliding spokes. Each spoke has attached to it a small roller which in its turn runs under a short pivoted rail controlled by a powerful set of springs. This arrangement permits the feet to accomodate themselves to obstacles even such as steps or stairs. The pedrail was invented by one B. J. Diplock of London, Eng.
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Century Dictionary and Cyclopedia
    • n pedrail A form of traction-engine, so constructed that the wheels rest their weight not on the ground-surface but on the units or links of a jointed chain, fed in front of the machine as it advances, and laid by it on the ground for the wheels to run on. These block- or link-rails are picked up by the wagon after it passes over them. The wheels do not sink in soft earth, as the track gives a greater bearing-surface for support. Great unevenness of surface is over-come by this plan, and the wheels can mount over logs and considerable obstacles.
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Webster's Revised Unabridged Dictionary
See Pedi-; Rail